Hub-area residents were out and about yesterday, taking advantage of the unusually balmy weather that forecasters expect to continue today and last into tomorrow before more seasonable, chilly temperatures return and the Bay State goes back to typical frigid and windy February conditions.Yesterday’s highs of 48 degrees in Boston, 47 in Providence and 50 in Hartford, Conn., helped diminish the snowbanks that had been built up by a series of powerful snowstorms that dumped more than a foot of snow on cities and towns across Massachusetts in recent weeks.